HTSC陶瓷中的局部冻结磁场
Locally frozen magnetic field in HTSC ceramics
摘要：
研究了0.5 mm厚YBa 2Cu 3 O 7-x板中直径为0.5 mm的区域中的局部冻结磁场值随激励场（至2 × 10^4 A/m）、板冷却模式（在无场或有场的情况下;即，零场冷却（ZFC）或场耦合（FC）），以及局部退磁场。对在上述激发场范围内的测量结果的分析表明：（1）ZFC模对激发场的依赖性是由陶瓷约瑟夫森介质中弱连接临界电流的局部不均匀性所解释的，并受实验温度（77 K）下临界电流最大值的限制;（ii）对于FC模式，对激励场的依赖性包含从冻结电流结构到ZFC冻结模式的电流结构特征的磁相变的一部分，冻结电流结构是依赖性的初始部分的典型特征，并且受限于这种转变;以及（iii）ZFC模式对退磁场的依赖性可以由陶瓷中具有相反电流方向的微观电流回路的稳定共存（没有湮灭）来解释。
英文摘要：
The value of a locally frozen magnetic field in a region with a diameter of 0.5 mm in a 0.5-mm-thick YBa2Cu3O7-x plate was investigated as a function of the excitation field (to 2x10^4 A/m), plate cooling mode (in the absence or presence of a field; i.e., zero-field cooling (ZFC) or field coupling (FC)), and local demagnetizing field. Analysis of the measurement results in the noted range of excitation fields showed the following: (i) the dependence on the excitation field for the ZFC mode is explained by the local inhomogeneity of critical currents of weak links in the ceramic Josephson medium and is limited by their maximum value at the temperature of the experiment (77 K); (ii) the dependence on the excitation field for the FC mode contains a portion of the magnetic phase transition from the frozen current structure, typical of the initial portion of the dependence, to the current structure characteristic of the ZFC freezing mode, and is limited by this transition; and (iii) the dependence on the demagnetizing field for the ZFC mode can be explained by the stable coexistence (without annihilation) of microscopic current loops with opposite current directions in the ceramics.
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